# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0887853        0.00602397    
     0.460000          0.700000         0.0901839        0.00432729    
     0.700000           1.00000         0.0818415        0.00443378    
      1.00000           1.54000         0.0947625        0.00396200    
      1.54000           2.40000          0.112640        0.00484399    
      2.40000           4.80000          0.151346        0.00550839    
      4.80000           10.0000          0.169566        0.00752846